研究生: |
張誼萱 Yi-Hsuan Chang |
---|---|
論文名稱: |
在C-RAN架構下具交遞速率優化之動態BBU與RRU關聯 Dynamic BBU and RRU Association with HO Rate Optimization in the C-RAN Architecture |
指導教授: |
馮輝文
Hui-Wen Ferng |
口試委員: |
林嘉慶
Jia-Chin Lin 謝宏昀 Hung-Yun Hsieh 沈上翔 Shan-Hsiang Shen |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 資訊工程系 Department of Computer Science and Information Engineering |
論文出版年: | 2021 |
畢業學年度: | 109 |
語文別: | 中文 |
論文頁數: | 58 |
中文關鍵詞: | C-RAN 、RRU聚合 、差分進化演算法 、負載平衡 、服務品質 、交遞率 |
外文關鍵詞: | C-RAN, RRU Aggregation, Differential Evolution, Load Balancing, Quality of Service, Handover Rate |
相關次數: | 點閱:395 下載:3 |
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雲端化無線存取網路 (Cloud Radio Access Network, C-RAN)為第五代行動通訊系統 (5th Generation Mobile Communication System, 5G)系統提供寬頻服務的新型態網路架構,其將傳統基地台分成兩部分:基頻處理單元 (Baseband Units, BBU)與遠端單元 (Remote Radio Unit, RRU),並將BBU從基地台 (Base Station, BS)分離並放置於雲端,以達成集中管理。本論文透過差分進化 (Differential Evolution, DE)演算法進行BBU和RRU的關聯,使服務品質 (Quality of Service, QoS)達到較佳的狀態,並且收斂到最佳值,再使用RRU聚合 (Aggregation)方法,將相鄰的RRU分配到相同扇區 (Sector),減少BBU的交遞 (Handover, HO)。透過模擬分析重新關聯率,相較於文獻上之相關文獻,本論文所提方法可達到使用者裝置 (User Equipment, UE)交遞頻率優化25%以上減少使用者交遞率,且透過計算負載公平性,可實現本論文所提方法在扇區與BBU中可達到負載平衡 (Load Balancing)。
The cloud radio access network (C-RAN) is a new architecture to provide broadband services for the fifth-generation (5G) mobile communication system by separating the baseband unit (BBU) and the remote radio unit (RRU) and allowing BBUs to be placed in the cloud for the centralized operation and scalable deployment of light-weight RRUs. In this thesis, the differential evolution (DE) algorithm is employed to associate BBUs and RRUs so that the quality of service (QoS) can reach the better one and converge to the best one. Further applying the graph-based RRUs aggregation method, adjacent (neighboring) RRUs can be managed by the same sector, reducing the BBU switching accordingly. Via the re-associated rate obtained by simulations, the averaged handover (HO) rate reduction achieved by our proposed mechanism as compared to the closely related mechanisms in the literature can be more than 25%. Our proposed mechanism also achieves load balancing between sectors and BBUs in terms of the fairness index.
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